From: Marc Postman (postman@stsci.edu)
Date: Tue Jan 24 2006 - 17:17:34 PST
From our (Lori + me) work with Bev Oke, the <SFR> for spectral class
type "k" (strong 4000 A break + strong Ca HK) galaxies in clusters at
z=0.9 is about half as high as it is for spectral class type "k"
galaxies not in the clusters (0.89 vs 1.67 solar masses/year). There
are fewer such k-type field galaxies of course but the cluster k-types
seem to be producing stars at a lesser rate. However, the significance
of this difference is marginal given the small number of galaxies in
this bin. Lori's new survey should do a far better job at quantifying
this. Still, this may be another mild indication that clusters are
better places to find dust-free early types. Note that k-type
correlates fairly well with morphology but it is a broad range,
encompassing S0 and E (and possibly some Sa).
Marc
On Jan 24, 2006, at 7:42 PM, Lori Lubin wrote:
>
> We have not quantified it entirely, but based on the first look, we
> also
> see a higher fraction in the field.
>
> Cheers,
> Lori
>
>
>
------------------------------------------------------------------------
-------------------
Marc Postman Email: postman@stsci.edu
STScI - CMO Phone: +1-410-338-4340
3700 San Martin Drive Fax: +1-410-338-4424
Baltimore, MD 21218 U.S.A. http://www.stsci.edu/~postman
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